Considered the “Boston Marathon” of the open water racing world, the Blackburn Challenge is a 20-mile open water circumnavigation of Cape Ann, Massachusetts.  “Challengers” row or paddle seaworthy watercraft in a range of classes including Banks dories, fixed seat singles and doubles, multi-oars with/without coxswains, sliding seat tour/race rowing singles & doubles, single & double touring kayaks, single & double racing kayaks, single & double surfskis, and OC-1 through OC-6 outrigger canoes.